Restartable sequences in glibc

"Restartable sequences" are small segments of user-space code designed to access per-CPU data structures without the need for heavyweight locking. It is a relatively obscure feature, despite having been supported by the Linux kernel since the 4.18 release. Among other things, there is no support in the GNU C Library (glibc) for this feature. That is about to change with the upcoming glibc 2.35 release, though, so a look at the user-space API for this feature is warranted.

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